You work as a Web Developer at Certkiller.com. You are in the process of creating a Webapplication using Microsoft ASP.NET 3.5.  You host the Web application in Microsoft Internet Information Services （IIS） 6.0. You browse theapplication and receive the following error message：  Server Application Unavailable  The web application you are attempting to access on this web server is currently unavailable.Please hit the "Refresh" button in your web browser to retry your request.  You view the Application event log and discover the following message：  It is not possible to run two different versions of ASP.NET in the same IIS process. Please use theIIS Administration Tool to reconfigure your server to run the application in a separate process.  To ensure productivity you need to solve this problem as quick as possible.  What should you do？（）

• A、You should change the IIS isolation mode.
• B、You should assign the application to another application pool.
• C、You should configure all applications that are part of your application's application pool in orderto use the same version of ASP.NET.
• D、You should run the Aspnet_regiis.exe Tool.
• E、You should restart the application pool that hosts the application.